Simple Charges/Induction Question

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SUMMARY

The discussion focuses on the process of using a negatively charged rubber rod to induce a net negative charge on a metal sphere through electrostatic induction. When the rubber rod is brought near the sphere, electrons within the sphere are attracted towards the rod, causing a redistribution of charge. If the sphere is grounded during this process, some electrons can leave the sphere, resulting in a net positive charge. However, to achieve a net negative charge, the grounding must be removed while the rod is still in proximity, allowing the sphere to retain excess electrons after the rod is removed.

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Homework Statement



How can you use a charged rubber rod to induce a net negative charge on a metal sphere?

Homework Equations



None.

The Attempt at a Solution



OK, I understand the basics, but it seems like this question should be worded so as to inducing a net "positive" charge on the metal sphere. It seems key to me that the rubber rod would have to be negatively charged, and if we're talking about induction (the two objects not touching), it would seem intuitive that bringing the rubber rod near the sphere would cause electrons to migrate to the side of the sphere opposite the sphere. If the sphere had a ground, some electrons would completely leave the sphere and the cutting the ground would leave the sphere with a net positive charge. But how the heck can you get the sphere to have a negative charge via induction? Or is there a means by which that rubber rod can be positively charged?
 
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The question doesn't say you have to charge the metal spherer via induction.
The terms induce there is not a scientific term. Its meaning is more like "cause".
 

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